| Message ID | 924931182.70312.1608123482150@office.mailbox.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Makefile: use smaller dictionary size for xz module compression | expand |
On Wed, Dec 16, 2020 at 9:59 PM <torvic9@mailbox.org> wrote: > > By default, xz without parameters uses a dictionary size of 8 MB. > However, most modules are much smaller than that. > The xz manpage states that 'increasing dictionary size usually improves > compression ratio, but a dictionary bigger than the uncompressed file > is waste of memory'. > Use a dictionary size of 2 MB for module compression, resulting in > slightly higher compression speed while still maintaining a good > compression ratio. > > Signed-off-by: Tor Vic <torvic9@mailbox.org> > --- Applied to linux-kbuild. Thanks. > Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/Makefile b/Makefile > index 076d4e6b9..f9a6d0a4d 100644 > --- a/Makefile > +++ b/Makefile > @@ -1058,7 +1058,7 @@ ifdef CONFIG_MODULE_COMPRESS > mod_compress_cmd = $(KGZIP) -n -f > endif # CONFIG_MODULE_COMPRESS_GZIP > ifdef CONFIG_MODULE_COMPRESS_XZ > - mod_compress_cmd = $(XZ) -f > + mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f > endif # CONFIG_MODULE_COMPRESS_XZ > endif # CONFIG_MODULE_COMPRESS > export mod_compress_cmd > -- > 2.29.2
diff --git a/Makefile b/Makefile index 076d4e6b9..f9a6d0a4d 100644 --- a/Makefile +++ b/Makefile @@ -1058,7 +1058,7 @@ ifdef CONFIG_MODULE_COMPRESS mod_compress_cmd = $(KGZIP) -n -f endif # CONFIG_MODULE_COMPRESS_GZIP ifdef CONFIG_MODULE_COMPRESS_XZ - mod_compress_cmd = $(XZ) -f + mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f endif # CONFIG_MODULE_COMPRESS_XZ endif # CONFIG_MODULE_COMPRESS export mod_compress_cmd
By default, xz without parameters uses a dictionary size of 8 MB. However, most modules are much smaller than that. The xz manpage states that 'increasing dictionary size usually improves compression ratio, but a dictionary bigger than the uncompressed file is waste of memory'. Use a dictionary size of 2 MB for module compression, resulting in slightly higher compression speed while still maintaining a good compression ratio. Signed-off-by: Tor Vic <torvic9@mailbox.org> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)